Okay kiddo, have you ever heard of making phone calls? Sometimes when we want to talk to someone far away, we pick up a phone and dial their number. But did you know that some companies offer special numbers to make those calls cheaper? One of those numbers is 10-10-321.
Here's how it works: instead of dialing the regular phone number, you dial 10-10-321 first. Then you'll hear a special message telling you to dial the phone number you want to talk to. Once you've done that, you'll be connected to the person you want to talk to just like normal.
The reason people use 10-10-321 is because it's usually cheaper than using their regular phone plan. It's kind of like finding a coupon for your favorite toy - you get to have fun for a little bit less money.
But you have to be careful, because sometimes the cheaper 10-10-321 rate will only last for a certain amount of time, maybe a few minutes, and after that your regular phone plan will kick in and you could end up paying more.
Does that make sense, little one?